Reid's addiction

[infinitycluster.livejournal.com]

Hey everyone, I hope its ok to ask this here. I recently started going back and watching earlier episodes that I missed several seasons ago, and just saw Revelations. I am very interested in the addiction sub-plot, I've been looking for episodes where the team actually catches on to what is happening with Reid. I don't want to sift through regular episodes because I'm dying to know what came of it. So, to make a long story short, can you guys tell me which of the episodes are Reid-centric, or have relevant info regarding his addiction?

Thanks:)